* Approximate absorption (Abs) and fluorescence emission (Em) maxima for conjugates, in nm. ** Reactive Dye or Biotin has the succinimidyl ester (SE, NHS ester) group unless noted otherwise. § Human vision is insensitive to light beyond ~650 nm, and therefore it is not possible to view the far-red– and near-infrared–fluorescent dyes by looking through the eyepiece of a conventional fluorescence microscope. NA = Not applicable.